EP4428310B1 - Arbeitsfahrzeug - Google Patents

Arbeitsfahrzeug

Info

Publication number
EP4428310B1
EP4428310B1 EP23188326.5A EP23188326A EP4428310B1 EP 4428310 B1 EP4428310 B1 EP 4428310B1 EP 23188326 A EP23188326 A EP 23188326A EP 4428310 B1 EP4428310 B1 EP 4428310B1
Authority
EP
European Patent Office
Prior art keywords
unit
controller
working vehicle
control valve
pressure oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP23188326.5A
Other languages
English (en)
French (fr)
Other versions
EP4428310A1 (de
EP4428310C0 (de
Inventor
Yuta Kobayashi
Shumpei OKUTANI
Koichi Shimizu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Takeuchi Manufacturing Co Ltd
Original Assignee
Takeuchi Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Takeuchi Manufacturing Co Ltd filed Critical Takeuchi Manufacturing Co Ltd
Publication of EP4428310A1 publication Critical patent/EP4428310A1/de
Application granted granted Critical
Publication of EP4428310C0 publication Critical patent/EP4428310C0/de
Publication of EP4428310B1 publication Critical patent/EP4428310B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3663—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat hydraulically-operated
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/123—Drives or control devices specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance

Definitions

  • the present invention relates to a working vehicle.
  • a dedicated service pipe and a dedicated solenoid valve are used to return pressure oil in a pipeline for a service actuator.
  • the conventional configuration thus presents a problem that the cost of components is high and the piping layout is complicated.
  • an object of the present invention is to provide a working vehicle that has a simple configuration with no dedicated service pipe and no dedicated solenoid valve and is also capable of automatically returning pressure oil in a pipeline for a service actuator when operation for releasing its lock of a quick hitch is performed.
  • the present invention relates to a working vehicle.
  • the working vehicle comprises a control valve unit with a service actuator control valve, a first drive unit supplying hydraulic oil to a primary side of the control valve unit, a travel unit, a lower body provided with the travel unit, an upper body slewably disposed on the lower body, a second drive unit causing the upper body to slew, a cab disposed in the upper body, a plurality of work units and a plurality of hydraulic traveling motors driven by pressure oil from secondary side of the control valve unit, an operation unit operated by an operator, a quick hitch that is driven by the pressure oil to lock in a state of being attached to an arm of the working unit, an attachment that comes to connect to the arm in response to the locking, a trigger-switch for sending a trigger signal according to operation by the operator, a plurality of solenoid valves of the service actuator control valve, a plurality of pipelines connected to the service actuator control valve, a hydraulic oil tank, and a controller.
  • the controller performs control that, in a case where the controller receives the trigger signal from the trigger-switch to release the lock of the quick hitch, the pressure oil in the plurality of pipelines is returned to the hydraulic oil tank by energizing the plurality of solenoid valves with the first drive unit stopped.
  • the controller uses a pressure in an accumulator and performs a series of control that a spool is reciprocated by the solenoid valve of the control valve for a service actuator to return the hydraulic oil fed to the pipeline for a service actuator to a hydraulic oil tank.
  • the controller performs control that the pressure oil is returned by alternately energizing the plurality of solenoid valves provided on both sides of a spool of the service actuator control valve. This configuration enables returning the pressure oil in the pipeline for a service actuator more reliably.
  • the controller performs control that the first drive unit is operated and the lock of the quick hitch is released after a first term required for returning the pressure oil has elapsed.
  • This configuration enables returning the pressure oil more reliably at the time of releasing the lock of the quick hitch.
  • the controller performs control that operation of a service actuator connected to the service actuator control valve is not received in a second term in which the trigger-switch operating.
  • This configuration makes it possible to prevent the pressure oil from being fed to the pipeline for a service actuator during a period between returning the pressure oil in the pipeline for a service actuator and releasing the lock of the quick hitch, even when the operator performs incorrect operation.
  • the working vehicle with higher safety can be achieved.
  • the working vehicle includes a travel unit, a lower body to which the travel unit is attached, an upper body provided on the lower body, and a cab provided on the upper body.
  • the trigger-switch includes a first button and a second button that are provided in the cab, and the trigger-switch sends the trigger signal by pressing both the first button and the second button. This configuration makes it possible to prevent the lock of the quick hitch from being released due to a malfunction. Thus, the working vehicle with higher safety can be achieved.
  • the working vehicle that has a simple configuration with no dedicated service pipe and no dedicated solenoid valve and is also capable of automatically returning the pressure oil in the pipeline for a service actuator when operation for releasing the lock of the quick hitch is performed.
  • Fig. 1 is a schematic view showing an example of a working vehicle 1 according to the embodiment, and is a perspective view from the upper left rear.
  • a hydraulic excavator is described herein.
  • the working vehicle 1 may be a track loader or a tracked dumper.
  • up and down, left and right, and front and rear directions may be represented by arrows in the diagrams.
  • members having the same functions are assigned the respective same reference characters, and the repetitive description thereof may be omitted.
  • the working vehicle 1 includes an on-board charger that supplies electric power to a plurality of electric motors and so on and a display unit 98 that is configured to display information on operation of a drive unit, information on remaining battery capacity, and other known vehicle information.
  • a display unit 98 that is configured to display information on operation of a drive unit, information on remaining battery capacity, and other known vehicle information.
  • devices for use in travel motion and work in the working vehicle 1 are common to those in a known working vehicle, and the detailed description thereof is omitted.
  • the working vehicle 1 includes a lower body 2 that is configured to travel and an upper body 3 that is provided on the lower body 2 and configured to slew.
  • the lower body 2 includes a travel unit 6, and the travel unit 6 has a left and right pair of crawlers (tracks), as an example.
  • the upper body 3 includes a cab 4, and the cab 4 has, in the front, operating units 5 for an operator riding on the vehicle to operate driving and work operations.
  • a part enclosed by a broken line P2 in the drawing shows a schematic configuration of the operating units 5.
  • the travel unit 6 includes a hydraulic motor 17a for travelling in a left travel body and a hydraulic motor 17b for travelling in a right travel body.
  • the travel unit 6 may be a travel unit having tires.
  • the working vehicle 1 includes a slewing unit 8 driven by a second drive unit 16.
  • the second drive unit 16 has an electric motor 16a to which a speed reducer 16c is assembled and has a configuration in which a pinion gear of the speed reducer 16c is engaged with a slewing bearing of the lower body 2 (not shown).
  • a slewing unit provided with a hydraulic motor can be used.
  • the working vehicle 1 is provided with a plurality of working units including a working unit 7 and a working unit 14, and the plurality of working units is configured to be operated hydraulically (by hydraulic oil at a predetermined pressure).
  • the working unit 14 includes a blade 51a, for example.
  • the blade 51a is attached to the lower body 2 as to swing in the up-down direction and in the up-down direction including the front and rear components.
  • the working unit 7 includes, as an example, a boom 51b, an arm 51c, and an attachment 51d such as a bucket.
  • the attachment 51d is, however, not limited to the bucket and a known attachment can be used.
  • the boom 51b is attached to the upper body 3 as to swing in the up-down direction and in the up-down direction including the front and rear components.
  • a boom bracket is provided (not shown) between the upper body 3 and the boom 51b.
  • the boom bracket enables the boom 51b to swing in the left-right direction and in the left-right direction including the front and rear components with respect to the upper body 3. Incidentally, the boom bracket is sometimes omitted.
  • the arm 51c is attached to the boom 51b as to swing in the up-down direction and in the up-down direction including the front and rear components.
  • the attachment 51d (bucket) is attached to the arm 51c as to swing in the up-down direction and in the up-down direction including the front and rear components.
  • the attachment 51d is caught and locked by a quick hitch 55 attached to the arm 51c.
  • a part enclosed by a broken line P1 in the drawing shows a schematic configuration of the quick hitch 55.
  • the blade 51a is configured to swing, by a blade cylinder 18a, in the up-down direction with respect to the lower body 2.
  • the arm 51c is configured to swing, by an arm cylinder 18b, in the up-down direction with respect to the boom 51b.
  • the attachment 51d (bucket) is configured to swing, by a bucket cylinder 18c, in the up-down direction with respect to the arm 51c.
  • the boom 51b is configured to swing, by a boom cylinder, in the up-down direction with respect to the upper body 3 (not shown).
  • the boom 51b is configured to swing, by a swing cylinder, in the left-right direction with respect to the upper body 3 (not shown).
  • the quick hitch 55 includes a fixed claw 55a, a movable claw 55b, and a quick hitch cylinder 56 (quick hitch actuator) for pivoting the movable claw 55b.
  • the operator operates the operating unit 5 to attach the fixed claw 55a to a first pin 57a provided in the attachment 51d (bucket), and then, to attach the movable claw 55b to a second pin 57b provided in the attachment 51d (bucket). Then, the quick hitch cylinder 56 is extended to lock the attachment 51d.
  • the quick hitch 55 In order to release the quick hitch 55, the operator operates the operating unit 5 to retract the quick hitch cylinder 56, and the attachment 51d is released.
  • the quick hitch 55 is not limited as above construction.
  • a trigger switch 30 includes a first button 31a (hand button) in the left operating unit 5 and a second button 31b (foot button) provided on the floor of the cab 4.
  • a trigger signal is sent to a controller 9, and control is carried out to release the quick hitch 55.
  • the working vehicle 1 includes a plurality of switches such as a key switch and a push switch for both starting and stopping the working vehicle 1 (not shown).
  • a service actuator such as a breaker is connected to a port 19a for the first service actuator.
  • a service actuator such as a swing actuator for rotating the quick hitch 55 around the longitudinal axis is connected to a port 19b for the second service actuator.
  • the quick hitch cylinder 56 (quick hitch actuator) is connected to a port 19c for the third service actuator (port for the quick hitch actuator).
  • Fig. 2 is a schematic circuit diagram showing an example of a drive control system in the working vehicle 1.
  • the working vehicle 1 includes a first drive unit 15 for supplying hydraulic oil at a predetermined pressure to the hydraulic motors 17a, 17b for travelling, the hydraulic cylinders 18a, 18b, 18c, and the ports 19a, 19b, 19c for the service actuators.
  • the working vehicle 1 also includes the second drive unit 16 for operating the electric swing unit 8.
  • the ports 19a, 19b, 19c for the service actuators are connection ports for hydraulically operating the individual attachments optionally attached. Incidentally, in the circuit diagram of Fig. 2 , some notations except for the main parts are omitted.
  • the working vehicle 1 includes a battery pack 47.
  • the battery pack 47 has a battery management system 48 and a lithium-ion rechargeable battery 49.
  • the lithium-ion rechargeable battery 49 is formed by combining many cells, and power supply voltage of the lithium-ion rechargeable battery 49 is 70 to 600 [V], for example.
  • the battery pack 47 is removable attached to the working vehicle 1.
  • the battery pack 47 contains various sensors therein, and a wiring diagram thereof is omitted.
  • the working vehicle 1 has a lead-acid battery 46 for supplying electric power to the battery management system 48 at the time of starting of the working vehicle 1.
  • the first drive unit 15 includes a first hydraulic pump 22a that draws in hydraulic oil stored in a hydraulic oil tank 54 to discharge the hydraulic oil, a first electric motor 21a for driving the first hydraulic pump 22a, and a first inverter 25a for supplying electric power to the first electric motor 21a according to a command from the controller 9. Further, the first drive unit 15 includes a second hydraulic pump 22b that draws in hydraulic oil stored in the hydraulic oil tank 54 to discharge the hydraulic oil, a second electric motor 21b for driving the second hydraulic pump 22b, and a second inverter 25b for supplying electric power to the second electric motor 21b according to the command. The first drive unit 15 is configured to combine a first output unit of the first hydraulic pump 22a with a second output unit of the second hydraulic pump 22b to feed the hydraulic oil to a primary side of a control valve unit 10.
  • the control valve unit 10 has a configuration in which primary sides of a plurality of control valves are connected in parallel.
  • primary sides of control valves 11a, 11b for the hydraulic motors, of control valves 12a, 12b, 12c for the hydraulic cylinders, and of control valves 13a, 13b, 13c for the service actuators are connected in parallel.
  • the number of control valves constituting the control valve unit 10 sometimes increases or decreases.
  • the control valve unit 10 includes a relief valve 43, and a primary side of the relief valve 43 is connected in parallel to the primary side of each of the control valves.
  • a secondary side of the relief valve 43 serves as a return passage for the secondary side, and hydraulic oil exceeding a set pressure is returned to the hydraulic oil tank 54.
  • the first drive unit 15 includes a first check valve 41a and a second check valve 41b.
  • a configuration is provided in which a primary side of the first check valve 41a is connected to the output side of the first hydraulic pump 22a, a primary side of the second check valve 41b is connected to the output side of the second hydraulic pump 22b, and a secondary side of the first check valve 41a is combined with a secondary side of the second check valve 41b to be connected to the primary side of the control valve unit 10.
  • backflow of the pressure oil from the first hydraulic pump 22a to the second hydraulic pump 22b can be prevented, and backflow of the pressure oil from the second hydraulic pump 22b to the first hydraulic pump 22a can be also prevented.
  • the first hydraulic pump 22a and the second hydraulic pump 22b are both fixed displacement gear pumps.
  • the first electric motor 21a and the second electric motor 21b are both synchronous motors and are both magnets-embedded motors (IPM motors). According to the above configuration, it is possible to quickly follow the increase in required flow quantity of the pressure oil.
  • a rated output of the first hydraulic pump 22a is the same as a rated output of the second hydraulic pump 22b.
  • maximum torque of the first electric motor 21a is the same as maximum torque of the second electric motor 21b.
  • the first drive unit 15 includes a rotation speed sensor 45a for detecting a rotation speed of the first electric motor 21a, and a rotation speed sensor 45b for detecting a rotation speed of the second electric motor 21b.
  • the first drive unit 15 includes a temperature sensor 44 for detecting a temperature of the hydraulic oil in the hydraulic oil tank 54.
  • the second drive unit 16 includes the electric motor 16a to which the speed reducer 16c is assembled and an inverter 16b that supplies electric power to the electric motor 16a according to the command.
  • the second drive unit 16 includes a rotation speed sensor 45c for detecting a rotation speed of the electric motor 16a.
  • the cab 4 is provided with an air conditioner 26.
  • the air conditioner 26 includes an electric motor 26a and an inverter 26b that supplies electric power to the electric motor 26a according to a command from the controller 9.
  • the operator operates the operating units 5 implemented by an operating lever, a joystick, or to operate the travel unit 6, the working unit 7, the slewing unit 8, the working unit 14, and so on.
  • an operation signal is output to the controller 9.
  • Fig. 3 is a schematic flowchart showing an operation procedure for control on returning the pressure oil in a pipeline for the service actuator in the working vehicle 1.
  • Fig. 4 is a schematic timing chart showing control on returning the pressure oil in the pipeline for the service actuator in the working vehicle 1.
  • Fig. 5A is a schematic circuit diagram schematically showing a state in which the pressure oil is returned in a pipeline 73 for a first service actuator and a state in which the pressure oil is returned in a pipeline 74 for a first service actuator in the working vehicle 1.
  • Fig. 5B is a schematic circuit diagram schematically showing a state in which the pressure oil is returned in a pipeline 77 for a second service actuator and a state in which the pressure oil is returned in a pipeline 78 for a second service actuator in the working vehicle 1.
  • step S1 of Fig. 3 the controller 9 determines whether a trigger signal has been received.
  • the operator presses both the first button 31a (hand button) of the operating unit 5 (operating lever) and the second button 31b (foot button) provided on the floor of the cab 4.
  • a trigger signal is sent to the controller 9.
  • the processing proceeds to step S2.
  • step S2 of Fig. 3 the controller 9 stops the first drive unit 15.
  • the controller 9 controls the first electric motor 21a and the second electric motor 21b to change from the idling state corresponding to the minimum rotation speed V0 to a state in which the rotation speed is zero, and stops the first electric motor 21a and the second electric motor 21b. Then, the processing proceeds to step S3.
  • step S3 of Fig. 3 the controller 9 sets a state in which operation of the service actuators is not received.
  • the controller 9 sets a state in which operation of a service actuator connected to the port 19a for the first service actuator is not received and sets a state in which operation of a service actuator connected to the port 19b for the second service actuator is not received. The processing then proceeds to step S4.
  • step S4 of Fig. 3 the controller 9 performs control that the pressure oil is returned in the pipeline 73 for the first service actuator, the pipeline 74 for the first service actuator, the pipeline 77 for the second service actuator, and the pipeline 78 for the second service actuator.
  • the controller 9 moves a spool forward by controlling a solenoid valve 71a of the first service actuator control valve 13a to return the pressure oil in the pipeline 73 for the first service actuator, and then the controller 9 stops energizing the solenoid valve 71a.
  • a down arrow 73a indicates the direction of returning the pressure oil.
  • the controller 9 moves the spool backward by controlling a solenoid valve 71b of the first service actuator control valve 13a to return the pressure oil in the pipeline 74 for the first service actuator, and then the controller 9 stops energizing through the solenoid valve 71b.
  • a down arrow 74a indicates the direction of returning the pressure oil.
  • the controller 9 moves a spool forward by controlling a solenoid valve 75a of the control valve 13b for the second service actuator to return the pressure oil in the pipeline 77 for the second service actuator, and then the controller 9 stops energizing the solenoid valve 75a.
  • a down arrow 77a indicates the direction of returning the pressure oil.
  • the controller 9 moves the spool backward by controlling a solenoid valve 75b of the control valve 13b for the second service actuator to return the pressure oil in the pipeline 78 for the second service actuator, and then the controller 9 stops energizing the solenoid valve 75b.
  • a down arrow 78a indicates the direction of returning the pressure oil.
  • the controller 9 returns the pressure oil in the pipelines for the service actuators through the series of operation. The processing then proceeds to step S5.
  • step S5 of Fig. 3 the controller 9 determines whether a first term T1 has elapsed. If the first term T1 has elapsed, then the processing proceeds to step S6.
  • step S6 of Fig. 3 the controller 9 releases the lock of the quick hitch 55.
  • step S7 of Fig. 3 the controller 9 determines whether the second term T2 has elapsed. If the second term T2 has elapsed, then the processing proceeds to step S8.
  • step S8 of Fig. 3 if the second term T2 has elapsed, then the controller 9 finishes the state in which operation of the service actuator is not received.
  • the working vehicle 1 which has a simple configuration with no dedicated service pipe and no dedicated solenoid valve and is also capable of automatically returning the pressure oil in the pipeline 73 for the first service actuator and the pipeline 74 for the first service actuator and of automatically returning the pressure oil in the pipeline 77 for the second service actuator and the pipeline 78 for the second service actuator in synchronization with the operation for releasing the lock of the quick hitch 55.
  • the configuration of the working vehicle 1 is not limited to the combination of the first electric motor and the second electric motor.
  • the working vehicle 1 may use one electric motor, or use an engine along with the electric motors.
  • the battery to supply DC power to the inverters is not limited to the lithium-ion rechargeable battery, and a secondary battery such as a nickel-metal hydride battery can be used. In this way, the working vehicle 1 is sometimes modified appropriately according to the specifications and so on.
  • a working vehicle (1) includes a control valve unit (10) with a service actuator control valve (13a), a first drive unit (15), a travel unit (6), a lower body (2), an upper body (3), a cab (4), a plurality of work units (7, 14) and a plurality of hydraulic traveling motors (17a, 17b), an operation unit (5), a quick hitch (55), an attachment (51d), a trigger-switch (30), a plurality of solenoid valves (71a, 71b) and a plurality of pipelines (73, 74), and a controller (9).
  • the controller (9) performs control that, in a case where the controller (9) receives the trigger signal from the trigger-switch (30) to release the lock of the quick hitch (55), the pressure oil in the plurality of pipelines (73, 74) is returned to the hydraulic oil tank (54) by energizing the plurality of solenoid valves (71a, 71b) with the first drive unit (15) stopped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Shovels (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (5)

  1. Arbeitsfahrzeug (1) mit
    einer Steuerventileinheit (10) mit einem Betriebsstellglied-Steuerventil (13a);
    einer ersten Antriebseinheit (15), die Hydrauliköl einer Primärseite der Steuerventileinheit (10) zuführt;
    einer Fahrantriebseinheit (6);
    einem Unterwagen (2), der mit der Fahrantriebseinheit (6) versehen ist;
    einem Oberwagen (3), der schwenkbar am Unterwagen (2) vorgesehen ist;
    einer zweiten Antriebseinheit (16), die bewirkt, dass der Oberwagen (3) schwenkt;
    einer im Oberwagen vorgesehene Kabine (4);
    einer Vielzahl von Arbeitseinheiten (7, 14) und einer Vielzahl von Hydraulikfahrmotoren (17a, 17b), die durch Drucköl von der Sekundärseite der Steuerventileinheit (10) angetrieben werden;
    einer von einem Bediener betätigte Bedieneinheit (5);
    einer Schnellkupplung (55), die durch das Drucköl angetrieben wird, um in einem Zustand gesperrt zu sein, in dem sie an einem Arm (51c) der Arbeitseinheit (7) angebracht ist;
    einem Anbauteil (51d), das in Reaktion auf das Sperren mit dem Arm (51c) verbunden wird;
    einem Auslöseschalter (30) zum Senden eines Auslösesignals entsprechend dem Betrieb durch den Bediener;
    einer Vielzahl von Solenoidventilen (71a, 71b) des Betriebsstellglied-Steuerventils (13a);
    einer Vielzahl von Rohrleitungen (73, 74), die mit dem Betriebsstellglied-Steuerventil (13a) verbunden sind;
    einem Hydrauliköltank (54); und
    einer Steuerung (9),
    dadurch gekennzeichnet, dass
    die Steuerung (9) eine Steuerung durchführt, dass in einem Fall, in dem die Steuerung (9) das Auslösesignal vom Auslöseschalter (30) empfängt, die Sperre der Schnellkupplung (55) zu lösen, das Drucköl in der Vielzahl von Rohrleitungen (73, 74) durch Erregen der Vielzahl von Solenoidventilen (71a, 71b) bei angehaltener erster Antriebseinheit (15) in den Hydrauliköltank (54) zurückgeführt wird.
  2. Arbeitsfahrzeug (1) gemäß Anspruch 1,
    wobei die Steuerung (9) eine Steuerung durchführt, dass das Drucköl durch abwechselndes Erregen der Vielzahl von Solenoidventilen (71a, 71b), die auf beiden Seiten eines Schiebers des Betriebsstellglied-Steuerventils (13a) bereitgestellt sind, zurückgeführt wird.
  3. Arbeitsfahrzeug (1) nach Anspruch 2,
    wobei die Steuerung (9) eine Steuerung durchführt, dass die erste Antriebseinheit (15) betätigt wird und die Verriegelung der Schnellkupplung (55) gelöst wird, nachdem eine erste Zeitdauer (T1) abgelaufen ist, die zum Zurückführen des Drucköls erforderlich ist.
  4. Arbeitsfahrzeug (1) nach Anspruch 3,
    wobei die Steuerung (9) eine Steuerung durchführt, dass der Betrieb eines mit dem Betriebsstellglied-Steuerventil (13a) verbundenen Betriebsstellglieds in einer zweiten Zeitdauer (T2), in der der Auslöseschalter (30) betätigt wird, nicht empfangen wird.
  5. Arbeitsfahrzeug (1) nach einem der Ansprüche 1 bis 4,
    wobei der Auslöseschalter (30) einen ersten Knopf (31a) und einen zweiten Knopf (31b) hat, die in der Kabine (4) bereitgestellt sind, und der Auslöseschalter (30) das Auslösesignal in Reaktion darauf sendet, dass sowohl der erste Knopf (31a) als auch der zweite Knopf (31b) gedrückt werden.
EP23188326.5A 2023-03-08 2023-07-28 Arbeitsfahrzeug Active EP4428310B1 (de)

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JP2011127676A (ja) 2009-12-17 2011-06-30 Kobelco Contstruction Machinery Ltd 建設機械の油圧回路
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JP2017187144A (ja) 2016-04-08 2017-10-12 株式会社竹内製作所 作業機械
WO2018164152A1 (ja) * 2017-03-07 2018-09-13 住友建機株式会社 ショベル
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